Adjusting mechanism.



W. T. SEARS. ADJUSTING MECHANISM.

APPLICATION FILED MAR. 27, 1914.

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specifications;Letters Patent.

Batentecl were. 23%, this,

I To all whom it may concern Be it known that I, WiLLARD T. Snare, a citizen of the United States, residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented. certain new and useful Improvements 111" Adjusting Meohanism,of which the follow ing is a specification. v

This invention relates to adjusting mechanism, the principal object of the invention being the provision of simple and effective means by which a support can be adjusted through the agency of a feed screw and nut, the construction being such that no injury can result to the parts should the support be inadvertently clamped in. an adwhich I have already briefly alluded.

, justed position 'while' the adjusting mechanism is in use.

The invention involves other points of novelty and advantage which with the foregoing will be stated at length in the following description, wherein 1 will set forth in detail that form of embodiment of the invention which I have selected for illustration in the drawing accompanying and forming part of the present specification, this showing being provided to enable those skilled in the art to practise the invention. I do not restrict myself to such disclosure; I may depart therefrom in several respects within the scope of the. invention covered? arm of such a drillwhioh arm presents a suitable support or carrier such as that ice n the case of a radial drill this support, carrier or arm is vertically adjustable and sustains the drill and certain other adjuncts which constituting no part of the present invention need not be illustrated and described herein. "A15 Shown the arm 2 has a chamber 3 co ered. by the cap Qr'plate 4: emo ah y he d in place by se eral as 5. In a,- radial drill the arm 2 is raised and lowered by a feed screw and cooperating nut, the screw being non-rotative and immovable in the direction of its longitudinal axis, The numeral 6 denotes such. a feed screw and so far as its mounting and feeding functions are concerned, it is exactly like that shown in the patent to which I have referred. This feed screw 6 extends entirely through the adjustable arm 2 and also through a nut as 7 therein, the-threads of the nut, as will be inferred, corresponding with those of the feed screw. Said nut is-rnounted for rotation in the socket 8 opening into the chamber 3 to which I have already referred, and it may be operated in any desirable manner for example by the worm gear 9 rotatively mounted in said chamber 8. In the present case, however, and as will hereinaftenappear, the effect of the worm gear '9 is not directly applied to the nut. lhe not as will hereinafter appear is immovable in the direction of its axis of rotation withrespect to the supporting arm 2; It, therefore, follows that'when the worm gear 9 is turned the nut 7 will be correspondingly rotated to effect the adjustment of the support 2 in the direction of the length of the screw 6. Between the body of the worm gear 9 and the depending hub 10 of the plate -l the anti-friction bearing 11 serving its usual function may be interposed,-the elongated hub 12 of said worm gear being rotativcly disposed in said hub 10. I provide for a slip connection between the wormgear 9 or equivalent operating member, and the nut 7 and for this purpose the approximately conical element 13 is shown, said conical element 13 surrounding the upper side of the nut 7 and being pinned or otherwise suitably connected. therewith; the pin 14 however, is shown for such purpose. The conical member 13 is disposed; in the conical socket or seat thin the under side of the worm gear 9, the cone or taper faces of these two parts being constantly in. contact, and there being sufficient frictional engagement between the two'to insure that the arm 2 will be adjusted on the rotation of the worm gear 9 or equivalent device. Should, however, the arm 52 he clamped in adjusted position and should the worm gear 9 he turned, no injury can result as the will We ease elethe movement of the arm 2 atthe ends of its traverse, and any suitable stop means may be'provided and although duplicated, this is not always necessary. It will be clear that when the arm is stopped at the extreme end of its movement in either direction and that if the worm gear 9 be still turned, no injury can result, in that the said Worm gear rides idly over the conical ele* ment 13. The means for stopping the arm 3 are preferably carried by the feed. screw 6 and as shown consist of stop pins 17 and,

-18. As shown these pins'are at right angles to the longitudinal axis of the feed screw and are driyen into holes extending" inward from the btottom ol the grooved pen tion of the thread of said feed screw. It will be noted that the terminal portions of. the thread of the nut 7 are squaredofi' as at 19, and this in itself is advantageous, in that the squared end surfaces of said thread abut squarly against the respective pins without any wedging action whatsoever. From the observations already made, it will be clear that there is to all intents and purposes a friction clutch between the operating member 9 and the feed nut 7. This is only one type of clutch; there are others I that I might employ with equal advantage. I desire to call attention to the fact that there is an advantage in squaring on the terminals of the thread of the nut as shown at 19, in that the arm 3 is properly arrested, that is without any wedging action. I desire to call attention to the fact that the weight of said arm 2 and the parts on said arm is sustained by the said friction clutch and thereby the engaging surfaces of. said clutch. In the construction'shown the feed screw .is fixed, the nut being rotary. This as will be inferred, is not essential, the adjustingmcchanism comprising broadly a feed screw and a nut regardless of the manner in which they are related for relative rotation.

.. .43 V. 6- reeling the movement vi to support at icense predetermined point, the adjustingmechanism and operating member being capable of relative rotation after said support is arrested y 2. The comb" ation of an arm, a feed screw, a nut rotatively supported by the non-rotary, an operating, member for the nut, friction clutch means disposed between the nut and the operating member; and stop means on the feed screw for engaging the nut to positively arrest the movement of the arm at predetermined points.

4:. The combination of a support, adjusting; mechanism for said support, consist ing of a nut and a feeds-crew, an operating member for the adjusting mechanism, trio tion clutch means for transferring the eliect ofthe operating member to the adjusting mechanism, a stop on the feed screw, a terminal of the threaded portion of the nut being squared 0E and being engageable by said step.

The combination of a support, adjush ing mechanism for said support, consisting; of a nut and a feed screw,an operating member for the adjusting mechanism, frie tion clutch means for transferring, the efi'ect of. the operating-member to the adjusting mechanism, and pinsflriven into the grooved portion of the feed screw near the ends thereof extending at right angles lie said All feed screw, the terminals of. the nut being squared .oti'and being adapted to be engaged by said pins when the support reaches the opposite ends of its movements. A

6. The combinationof a. support, adjusts ing mechanism forsaid support, comp-Ids ing a nut and a feed screw, and a stop on the feed screw, it terminalozf the threaded portion of the nut being squared-oil and being engageable by said stop.

7. The combination of a support,-adjust-" ing mechanism for said support, consisting of a nut and a. feed screw,'an operating member for the adjusting mechanism, trio tion clutch means for transferring the eltect of the operatln member to the adjusting mechanism, an means for preventin relative rotation of the nut and theflfeec screw at a predetermined point.v y i 8. The combination of a support, adjust: mechanism for said support, compris mosses ring a, nut and o Sseed screw an onemting member for the adjusting mechanism, friction dutch means for transferring the of feet of the operatin 7 member to the adjusting mechanism, on means for preventing relative rotation of the screw and the nutat predetermineci poinss in opposite adjustments. i

9. The combination of a support, adjusting mechanismfor she support compris ing a nut and a feed screw an operating member for the adjusting mechanism, and friction clutch means for transferring the efiect of she operating member to she ecljusting mechanism, the friction clutch means sustaining said supporii.

10. The combination of a support, edjusting mechanism for said support comprising a nut anda feed screw, on operasing member for she adjusting mechanism and friction clutch .ineans inclosed by and sustaining said suppori,'said fricizion oiutch means being adapted. to sransfer the efibci; of the operoiing member to the adjusting mechanism.

11. The combination of o.- suppc-rt, 21$

' justing mechanism for saiei suppori: com

prising a. nut and a feed screw, as operating member for the aijusiing mechanism means for positively arresing the moss ment of the support at a predstermine'ri. point, and means for transferring the fact of the operating member to the adjusting mechanism and for permitting relative movementvof the adjusting mechanism and: operating member when said; support is orrested.

12. The combination of a support, sci

jusiing mechanism for said support, comprising a nut and a, feed screw, on operas ing member for the adjusting mechanism, friction clutch means for transferring the eflect of the'operating member to the ML justmg mechanism, a. stop on the feed screw, the not having a stop and the two stops cooperating to prevent relative rototion of said -feeii screw an& out or o @Z'Eifitermined point, 7

13. The combination of n support, odjusting mechanism for said support comprising a nut and a feed? screw, on onerotmg member for the adjusting mechanism, friction clutch moons for causing relative "mission of the screw and the nus, and stops disposed at fixed; points for overcoming ihe resistance of the friction siwtch means anci' 

